Anuran community of a coastal Atlantic Forest fragment in the state of Rio de Janeiro, southeastern Brazil
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- Elza Palmeira Canedo
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1 SALAMANDRA 50(1) Anuran 30 April community 2014 ISSN of Espraiado, state of Rio de Janeiro Anuran community of a coastal Atlantic Forest fragment in the state of Rio de Janeiro, southeastern Brazil Angele Martins 1, Rafael Pontes 1, Camila Mattedi 1, Jéssica Fratani 1, Roberta A. Murta-Fonseca 1, Luciana Ramos 1 & Amaurício Lopes Rocha Brandão 1,2 1) Museu Nacional/UFRJ, Departamento de Vertebrados, Setor de Herpetologia, Quinta da Boa Vista, s/n, Rio de Janeiro, RJ, Brazil, CEP ) Instituto Federal de Educação, Ciência e Tecnologia do Ceará IFCE Campus Acaraú, Av. Des. Armando de Sales Louzada, s/n, Monsenhor Edson Magalhães, Acaraú, CE, CEP , Brazil Corresponding author: Angele Martins, angelemartins@gmail.com Manuscript received: 9 July 2013 Accepted: 24 November 2013 by Edgar Lehr Abstract. We conducted an anuran survey in a forest fragment of approximately 800 ha situated in the municipalities of Maricá, Saquarema, and Tanguá (22 52 S; W; m a.s.l., SAD69), in Rio de Janeiro state, Brazil, comprising matrices of dense ombrophilous forest and disturbed areas. This study aimed to render an inventory of the anuran species present in the area and provide data on spatial and temporal distribution, as well as natural history information on the species. Fieldwork was performed monthly between January 2011 and December 2012, during which anurans were sampled by means of Visual Encounter Surveys (VES) and 1 m 2 plots. Total sampling effort was 411 man/hours (for VES) and 180 m 2 of surveyed leaf litter (for plots). We recorded 44 species of frogs, with Hylidae being the most representative family. The VES method recorded an abundance of 2.8 individuals/hour, and plot sampling yielded an estimated density of 4 individuals/100 m 2. The species rarefaction curve did not reach an asymptote, indicating that an increase of sampling effort could still expand the number of recorded species. Our results reflect the relevance of the maintenance of this important and so far unprotected forest remnant in the state of Rio de Janeiro. The species richness found here indicates that the studied area, despite its small size, should be considered a priority area for amphibian conservation. Key words. Conservation, diversity, Espraiado, Mato Grosso Mountain Range, microhabitat use, richness, similarity, spatial and seasonal distribution, vocalization sites. Introduction The number of studies on amphibian communities in the Atlantic Forest has grown considerably over the past decade (e.g., Moraes et al. 2007, Carvalho-e-Silva et al. 2008, Bertoluci et al. 2009, Wachlevski & Rocha 2010, Vilela et al. 2011, Martins et al. 2012). However, despite the variety of such studies, they have been unbalanced in their approaches, field methods, and research designs (e.g., Bernarde et al. 1999, Giaretta et al. 1999, Eterovick & Sazima 2000) and therefore, more long-term studies using intensive approaches are still necessary in order to provide enough knowledge about this group (Silvano & Segalla 2005). Previous studies on anuran communities conducted in Rio de Janeiro state (e.g., Carvalho-e-Silva et al. 2008, Rocha et al. 2008, Silva et al. 2008, Almeida-Gomes et al. 2008, 2010, Salles et al. 2009, Martins et al. 2012, Pontes et al. in press) have demonstrated that although the original Atlantic Forest habitat has been highly disturbed, it still harbours important forest fragments with a relatively high degree of connectivity (Rocha et al. 2003), which facilitates the occurrence of a diverse anuran community. These forest remnants in Rio de Janeiro state are included in the Serra do Mar corridor (MMA 2006) and play an important role in the conservation of endemic and/ or threatened anuran species (Rocha et al. 2004) and thus should be considered priority areas for anuran species conservation in the state. Herein we present the results of two years of monitoring the anuran community in a secondary ombrophilous forest fragment within the Atlantic Forest biome in Rio de Janeiro state, providing data on the local composition, natural history and ecology of anuran species. Material and methods Study area The study area consists of a secondary forest fragment of approximately 800 ha in size, known as Espraiado 2014 Deutsche Gesellschaft für Herpetologie und Terrarienkunde e.v. (DGHT), Mannheim, Germany All articles available online at 27
2 Angele Martins et al. ( S, W). This area lies in the Mato Grosso mountain range and its surroundings, covering areas in the municipalities of Maricá, Saquarema, and Tanguá, in the state of Rio de Janeiro, Brazil (Fig. 1). The vegetation is composed by lowland ombrophilous formations (sensu Veloso et al. 1991) at different levels of degeneration and regeneration due to urban growth and agriculture in the last decades (Pontes et al. 2012). This area has not yet been the target of botanical studies and therefore, analyses were performed to characterise the vegetation found in the area. Trunk diameters and heights of trees of more than 5 cm in diameter at chest height (DBH) were measured at three random sites within a 100 m 2 area with a measuring tape to the nearest 1 cm. The total circumferences of these trees were converted into diameter applying the formula of D = C/π, where D is the diameter, C the circumference and π = 3,14. We measured a total of 100 trees for their diameters. Tree height was estimated by the trigonometric method (Soares et al. 2006), where the distance between the observer and the tree was measured with a measuring tape to the nearest 0.1 m, and the angle between the tree and the observer (at the eye level) was measured with a manual clinometer. We analysed a total of 70 trees at three randomly chosen sites. Canopy cover was estimated in nine areas, using photos of cm taken 1 m above ground level. The pictures were divided into 2,925 quadrants and the number of quadrants covered by vegetation was considered to be equal to the percentage of vegetation cover. According to the Köppen classification, the climate of the area is Aw, being hot and humid with average temperatures ranging from C (Kottek et al. 2006, Barbiére & Coe-Neto 1999). The dry season extends from May to June and the rainy season comprises the months from September to March (Kottek et al. 2006, Barbiére & Coe-Neto 1999) although most of the rainfall (around 60%) is concentrated in the months of December and January (Barros et al. 2007). Data collection Twenty-four field expeditions were conducted once a month from January 2011 through December 2012; however, data collected from January through December 2011 was only computed for species richness, considering that we did not have a pattern in fieldwork techniques during this period (e.g., VES times not limited and no plots used; see below) in order to achieve comparable results. In the period from January through December 2011, a team of three to five researchers performed random searches for unlimited periods of time in the study area, investigating the forest and temporary ponds in its surroundings, totalling 321 man hours of sampling effort. For statistical analysis, only data obtained from January through December 2012 were used, which was when forest and riverside areas were investigated with VES and plot sampling methods. The sampling method of Visual Encounter Survey (VES) (sensu Crump & Scott 1994) conducted from January through December 2012 consisted of a team of five researchers each randomly searching microhabitats (e.g., Figure 1. Delimitation of the study area of Espraiado (solid white line), encompassing parts of the municipalities of Maricá, Saquarema, and Tanguá, Rio de Janeiro state, southeastern Brazil. 28
3 Anuran community of Espraiado, state of Rio de Janeiro leaves, burrows in rocky outcrops and logs) for amphibians during a period of 30 minutes each, three times per night, totalling 7.5 man hours/night of sampling effort and therefore totalling 90 man hours from January through December In addition, each researcher randomly searched three square plots of 1 m 2 per night, which were demarcated on the forest floor, totalling 15 m 2 of leaf litter area investigated per field expedition, and a total of 180 m 2 for the whole period. Plot areas were delimited by fences in order to prevent frogs inside from escaping, and set randomly on the forest floor, with a minimum distance of 5 m between each researcher. For each plot, we estimated the mean leaflitter depth by measuring its depth with a ruler to the nearest 0.01 cm at the corners of the plot and calculating the mean value. Data were gathered on some abiotic variables deemed important to amphibian activity (Heyer et al. 1994). Temperature and humidity were obtained by means of a digital thermo-hygrometer (to the nearest 0.2 C and 0.2% humidity) at the beginning and end of conducting a VES, where only the average between these two measurements was considered for further comparisons. Rainfall data were obtained from the closest meteorological station of the Instituto Nacional de Meteorologia INMET located at Forte de Copacabana, municipality of Rio de Janeiro. This station ( S, W; SAD 69) is about 45 km distant from the study area, and thus we assume for our data analysis that it is exposed to similar climatic conditions. Voucher specimens were euthanised and fixed according the standard procedures of McDiarmid (1994) and deposited in the collection of amphibians at the Museu Nacional/Universidade Federal do Rio de Janeiro (MNRJ). Those captured specimens that were not euthanised were released in the same area at the end of a searching stint. Specimens were classified following the nomenclature of Frost (2013) and identified through direct comparisons with literature data and specimens in the collection of amphibians at the Museu Nacional/Universidade Federal do Rio de Janeiro (MNRJ). Data analysis To evaluate the efficiency of our sampling methods, a rarefaction curve of species captured with the VES method was generated (Krebs 1999) with 1,000 randomisations from a data matrix of abundance, totalling 12 samples, where each sample corresponded to a month, from January through December Species richness in the study area was estimated by the extrapolation of the accumulation curve, using Jackknife1 as the estimator in EstimateS 7.0 software. An estimate of anuran diversity was obtained via the Shannon- Wiener index (Magurran 1988) using DivEs 2.0 software. We conducted chi-square tests to check if different types of microhabitats used by frogs differed statistically. A Spearman Correlation analysis was performed to compare climatic conditions during the sampling period with available data from previous decades (1961 through 2010, available from the INMET database). To check the influence of environmental data on amphibian abundance, multiple regression analyses were conducted, including data on rainfall, temperature and humidity as independent variables. The normality of the data was tested with the Kolmogorov- Smirnov analysis (Zar 1999). Statistical analyses were performed with Statistica 7 software, using a significance index of p < 0.05 for all analyses. To compare the anuran species composition in our study area with different communities reported for other sites within the Atlantic Forest domain, Jaccard similarity analyses were performed with PRIMER 6 software, clustering groups with the group-average method. To ensure the comparability of data, only those anuran surveys that were undertaken over periods of one to two annual cycles were selected. The localities that were considered for our similarity analysis are listed in Table 1. To avoid possible misidentifications, only species reliably identified at species level were used, excluding species that could be identified only as cf., gr., sp. or aff.. Results Vegetation of the study area Our data indicate that the studied area is composed of heterogeneous secondary forest, although some sub-areas still harbour well-preserved primary vegetation, frequently around the tops of mountains. We also observed the presence of several exotic species, such as the ornamental plant Tradescantia zebrina Heynh ex. Bosse, banana trees (species of Musa Linnaeus) and jackfruit trees (Artocarpus heterophyllus Lam.). The vegetation includes arboreal elements (20 39 individuals/100 m 2 ; 32 ± 10.4 individuals/100 m 2 ) with bromeliads and other epiphytes. The arboreal elements had DBH values ranging from cm (17.3 ± 16.1 cm). Tree height ranged from 2 22 m (10 ± 5.2 m). Canopy cover was a minimum of 96.2 and a maximum of 99.7% (97.9 ± 1.1%). Marginal areas were marked by the removal of original vegetation for utilisation as pastures, with the vegetation being characterized mostly by grass and shrubs. Furthermore, some core areas were found to be affected by the removal of original vegetation, mostly along the banks of rivers through banana plantations. Anuran species composition We recorded a total of 44 anuran species, with the Hylidae being the most speciose family (24 spp.), followed by Leptodactylidae (7 spp.) (Tab. 2). According to the IUCN Red List (IUCN, 2013), all species except for Scinax trapicheiroi which is considered Near Threatened (NT) are classified as Least Concern (LC) regarding their conservation status (Tab. 3). We recorded an abundance of 2.8 individuals/hour with the VES method, with higher abundance levels in the rainy 29
4 Angele Martins et al. Table 1. Localities, municipalities, states and sources of data for different amphibian communities reported from the Atlantic Forest domain used in Jaccard similarity analyses for comparison with the study area. Locality Municipality State Source João Pessoa Paraíba Santana et al Reserva Sapiranga Mata de São João Bahia Juncá 2006 Camamu Itapebi and Prado Bahia Silvano & Pimenta 2003 Reserva Biológica de Duas Bocas Cariacica Espírito Santo state Prado & Pombal 2005 Parque Estadual dos Três Picos Nova Friburgo Rio de Janeiro Siqueira et al Parque Estadual Serra do Brigadeiro Araponga, Divino, Ervália, Fervedouro, Miradouro, Muriaé, Pedrão Bonita, and Sericita Minas Gerais Moura et al Rio Novo Minas Gerais Feio & Ferreira 2005 Reserva Particular do Patrimônio Santa Bárbara and Catas Altas Minas Gerais Canelas et al Natural Santuário do Caraça Ribeirão Branco and Apiaí São Paulo Pombal 1997 Parque Estadual Mata do Godoy Guararape São Paulo Bernarde & Kokubum 1999 Parque Estadual de Intervales of Guapira, Ribeira Branco, Sete Barras, El Dorado, and Iporanga São Paulo Bertoluci & Rodrigues 2002 Parque Estadual Carlos Botelho São Miguel Arcanjo, Capão Bonito, and Sete Barras São Paulo Bertoluci et al Parque Estadual da Ilha do Cardoso Cananéia São Paulo Bertoluci et al Londrina Paraná Bernarde & Anjos 1999 Parque Estadual do Rio Guarani Três Barras Paraná Bernarde & Machado 2001 Área de Proteção Ambiental Guaratuba São José dos Pinhais Paraná Cunha et al Table 2. Anuran species recorded from different environments (forested areas and ponds) in Espraiado, Rio de Janeiro state, southeastern Brazil. Legend: Ll: leaf litter; F: forest; Wa: water; Ro: rock; Bl: bromeliad; Br: branch; Ca; canopy; P: pond; Vo: vocalization record; Le: leaf; Sa: sand. Taxonomic category Forest Pond Vocalization site Brachycephalidae Günther, 1858 Ischnocnema guentheri (Steindachner, 1864) Ll (12) F/Ll Ischnocnema octavioi (Bokermann, 1965) Ll (3) Ischnocnema parva (Girard, 1853) Ll (1), Vo Bufonidae Gray, 1825 Rhinella icterica (Spix, 1824) Ll, Wa (13) P/Ll Rhinella ornata (Spix, 1824) Ll, Wa (17) P/Ll Craugastoridae Hedges, Duellman & Heinicke, 2008 Haddadus binotatus (Spix, 1824) Ll (74) F/Ll Cycloramphidae Bonaparte, 1850 Thoropa miliaris (Spix, 1824) Ro, Ll, Wa (61) F/Ro Zachaenus parvulus (Girard, 1853) Ll (1) Hemiphractidae Peters, 1862 Fritziana goeldii (Boulenger, ) Bl (1) F/Bl, Banana Gastrotheca albolineata (Lutz & Lutz, 1939) Br (2) F/Br Hylidae Rafinesque, 1815 Aplastodiscus eugenioi (Carvalho-e-Silva & Carvalho-e-Silva, 2005) Le, Br (6) F/Le 30
5 Anuran community of Espraiado, state of Rio de Janeiro Taxonomic category Forest Pond Vocalization site Dendropsophus anceps (Lutz, 1929) Br, Le (6) P/Br Dendropsophus bipunctatus (Spix, 1824) Le, Br (13) P/Br Dendropsophus decipiens (Lutz, 1925) Le (1) P/Br Dendropsophus elegans (Wied-Neuwied, 1824) Le (8) P/Br Dendropsophus meridianus (Lutz, 1954) Le (49) P/Br Dendropsophus minutus (Peters, 1872) Vo P/(?) Dendropsophus aff. oliveirai Le, Br (21) P/Br Dendropsophus pseudomeridianus (Cruz, Caramaschi & Dias, 2000) Le, Br (9) P/Br Dendropsophus seniculus (Cope, 1868) Vo P/(?) Hypsiboas albomarginatus (Spix, 1824) Le (5) Le (34) P/Br Hypsiboas faber (Wied-Neuwied, 1821) Br (12) F/Br Hypsiboas semilineatus (Spix, 1824) Br (9) F/Br Itapotihyla langsdorffii (Duméril & Bibron, 1841) Br (1) Phasmahyla guttata (Lutz, 1924) Ll, Ro, Br, Le (87) F/Br,Le Phyllomedusa burmeisteri Boulenger, 1882 Vo Phyllomedusa rohdei Mertens, 1926 Le (8) P/Br,Le Scinax alter (Lutz, 1973) Br (20) P/Br Scinax humilis (Lutz, 1954) Br (7) F/Br Scinax trapicheiroi ( Lutz, 1954) Le, Ro,Br (109) F/Br Scinax aff. v-signatus (Lutz, 1968) Bl (2) F/Bl Scinax aff. x-signatus Br (Vo) P/Br (Vo) Sphaenorhynchus planicola (Lutz & Lutz, 1938) Le, Wa (8) P/Wa Hylodidae Günther, 1858 Crossodactylus gaudichaudii Duméril & Bibron, 1841 Ro, Sa, Ll, Wa (72) F/Wa,Ro Hylodes cf. pipilans Wa, Ro, Ll, As (20) Leptodactylidae Werner, 1898 Adenomera aff. marmorata Ll (1) F/Ll Adenomera marmorata Steindachner, 1867 Ll, Le (22) F/Ll Adenomera thomei (Almeida & Angulo, 2006) Ll (5) F/Ll Leptodactylus fuscus (Schneider, 1799) Vo P/(?) Leptodactylus latrans (Steffen, 1815) Ll (2) Ll, Wa (9) P/Wa Leptodactylus mystacinus (Burmeister, 1861) Ll (1) Physalaemus signifer (Girard, 1853) Ll, Wa (47) F/Wa,Ll Microhylidae Günther, 1858 Myersiella microps (Duméril & Bibron, 1841) Ll (2) Odontophrynidae Lynch, 1971 Proceratophrys boiei (Wied-Neuwied, 1824) Ll (2) F/Ll season (3.3 individual/hour) compared to the dry season (2.3 individuals/hour) (Fig. 3). Scinax trapicheiroi and Phasma hyla guttata were the most abundant species, with 13.6 and 10.9% of the total records, respectively. The high abundances found for S. trapicheiroi did not occur homogeneously throughout all areas surveyed with the VES method, but in specific backwater areas along riversides. On the other hand, high abundances for P. guttata were recorded more homogeneously throughout riverside areas. The estimated overall density of frogs living in leaf litter was 4 individuals/100 m 2, represented by the species Crosso dactylus gaudichaudii, Haddadus binotatus, Ischno cnema guentheri, Adenomera marmorata, and Phasma hyla guttata. The most abundant species recorded by means of plot-sampling were H. binotatus and C. gaudichaudii, which together represented 28.6% of all anurans sampled. Higher capture rates (85.8% of the individuals captured; n = 6 plots in which anurans were found) in plot-sampling were obtained during the rainy season, compared to 14.2 % of individuals captured (n = 1 plot in which anurans were found) during the dry season. Leaf litter depths varied from 3.4 to 4.8 cm, showing little difference throughout the year (Fig. 4). 31
6 Angele Martins et al. Table 3. Distances of anuran microhabitats above the ground and from the nearest water body recorded in Espraiado, municipalities of Maricá, Saquarema, and Tanguá, Rio de Janeiro state, southeastern Brazil, and their conservation status. Numbers represent classes of distance from ground and water: (I) cm; (II) cm; (III) > 200 cm; ALL: above leaf litter; WLL: within leaf litter; Riv: river; Pon: Pond; LC: Least concern; DD: data deficient; NT: near threatened. Taxonomic category Ground distance (m) Distance from water body (m) Conservation Status Anura Fischer von Waldheim, 1813 Brachycephalidae Günther, 1858 Ischnocnema guentheri (Steindachner, 1864) ALL III LC Ischnocnema octavioi (Bokermann, 1965) ALL II LC Ischnocnema parva (Girard, 1853) ALL III LC Bufonidae Gray, 1825 Rhinella icterica (Spix, 1824) ALL III LC Rhinella ornata (Spix, 1824) ALL III LC Craugastoridae Hedges, Duellman & Heinicke, 2008 Haddadus binotatus (Spix, 1824) ALL III LC Cycloramphidae Bonaparte, 1850 Thoropa miliaris (Spix, 1824) ALL (Riv) I LC Zachaenus parvulus (Girard, 1853) ALL I LC Hylidae Rafinesque, 1815 Hypsiboas faber (Wied-Neuwied, 1821) II III LC Hypsiboas semilineatus (Spix, 1824) II II LC Phasmahyla guttata (Lutz, 1924) II (Riv) II LC Scinax trapicheiroi (Lutz, 1954) II (Riv) II NT Hylodidae Günther, 1858 Crossodactylus gaudichaudii Duméril & Bibron, 1841 ALL (Riv) I LC Hylodes cf. pipilans ALL, I I Leptodactylidae Werner, 1898 Adenomera aff. marmorata ALL, WLL III Adenomera marmorata Steindachner, 1867 ALL, WLL III LC Adenomera thomei (Almeida & Angulo, 2006) ALL III LC Leptodactylus latrans (Steffen, 1815) ALL (Pon) I LC Leptodactylus mystacinus (Burmeister, 1861) ALL III LC Physalaemus signifer (Girard, 1853) ALL (Pon) I LC Microhylidae Günther, 1858 Myersiella microps (Duméril & Bibron, 1841) ALL, WLL (Riv) III LC Odontophrynidae Lynch, 1971 Proceratophrys boiei (Wied-Neuwied, 1824) ALL, WLL (Pon) II LC Spatial and temporal distribution Species of the families Brachycephalidae, Bufonidae, Craugastoridae, Cycloramphidae, Hylodidae, Leptodactyli dae, Microhylidae, and Odontophrynidae were more commonly associated with microhabitats on ground level, whereas Hylodidae and Cycloramphidae seemed to prefer riverside microhabitats (e.g., sand, rocks, and water). However, Hylodes cf. pipilans was sporadically recorded inactive on leaves or branches close to streams, mostly at night, at between 0.2 and 0.6 m above the ground. Most of the species belonging to the families Hylidae and Hemiphractidae were observed in arboreal microhabitats, such as branches and leaves. Notwithstanding, some species were found merely transiting through ground microhabitats (e.g., leaf litter) such as Phasmahyla guttata and Scinax trapicheiroi (Tab. 2). Hylidae species perched at similar average distances from the ground, ranging from 1 to 2 m above ground, except for Aplastodiscus eugenioi, which was seen at heights of 3 to 4 m above the ground (Tab. 3). In addition, some species were encountered exclusively in bromeliads, such as Scinax aff. v-signatus, or exclusively on canopy branches, such as Gastrotheca albolineata. 32
7 Anuran community of Espraiado, state of Rio de Janeiro Species richness Samples Figure 2. Rarefaction curve estimated for anuran species with the Jackknife1 estimator (black squares), estimated confidence interval of 0.95 % (grey lines), and accumulation curve (grey circles) for Espraiado, municipalities of Maricá, Saquarema, and Tanguá, Rio de Janeiro state, southeastern Brazil, from January through December For most of the species recorded in the area, vocalization site records coincided with the microhabitat used by a species while foraging or inactive. Only Aplastodiscus eugenioi vocalized from branches/bromeliads in the canopy during the dry season, and was recorded on branches close to the ground during the rainy season (Tab. 3). Data analysis The rarefaction curve of species found during visual encounters showed a rapid increase in the number of species when the sampling effort was increased. Although the curve tended to move towards the asymptote, it did not reach a plateau. Based on the Jackknife1 estimator, the species richness for the area was estimated at 58.3 ± 3.77 species (Fig. 2). According to the Shannon-Wiener index, the frog diversity in the study area was H = Chi-square tests revealed that anurans preferred to use terrestrial microhabitats (n = 261, χ 2 = 44.7), such as leaf-litter or bare soil, rather than rocks (n = 44, χ 2 = 1.2), water (n = 25, χ 2 = 4.05, df = 6), sand (n = 4, χ 2 = 29.7, df = 6), or arboreal habitats such as leaves (n = 82, χ 2 = 53.7, df = 6), branches (n = 56, χ 2 = 9.38, df = 6), or bromeliads (n = 4, χ 2 = 29.7, df = 6). Spearman correlation obtained through the comparison of previous decades with the studied period were not significant for rainfall data (R = 0.230, p = 0.470), whereas temperature was significant (R = 0.627, p = 0.028). According to multiple regressions, amphibian abundance does not seem to be related to any of the abiotic factors considered (F 3, 8 = 0.219; p = 0.880; r = for the entire analysis; F 3, 8 = 0.219; p = for rainfall; F 3, 8 = 0.219; p = for temperature; and F 3, 8 = 0.219; p = for relative humidity) (Fig. 3). With regard to total frog abundance, higher values were computed in rainy seasons compared to dry seasons. The similarity analysis that compared Atlantic Forest compositions between different areas showed two well-defined groups: one comprising the more northern localities (Rio de Janeiro to Bahia state) and the other the localities from farther south (São Paulo and Paraná states) (Fig. 5). The frog assemblage of Espraiado was part of the northern group and, within it, it was closest to the frog assemblages of Parque Estadual dos Três Picos (Rio de Janeiro state), Parque Estadual da Serra do Brigadeiro (Minas Gerais state), and Reserva Particular do Patrimônio Natural Santuário do Caraça (Minas Gerais state). Discussion Anuran composition, diversity and similarity The amphibian species composition in the study area resembles those reported in other studies that were carried out in ombrophilous forest areas in the state of Rio de Janeiro (e.g., Carvalho-e-Silva et al. 2008, Almeida-Gomes et al. 2010, Siqueira et al. 2011a, Pontes et al. unpubl. data), with the Hylidae family likewise being predominant in the community recorded herein. This pattern has been traditionally associated with the capability of these species to occupy vertical strata due to the presence of adhesive discs on their digits (Cardoso et al. 1989, Pombal 1997, Prado & Pombal 2005).). Therefore, this characteristic facilitates a simultaneous presence of a higher number of Hylidae species within an area because they are able to segregate vertically in addition to horizontal- 33
8 Angele Martins et al. Abundance (n) Abundance (n) Abundance (n) Samples Samples Samples Figure 3. Correlation of recorded anuran abundance and abiotic factors in Espraiado, municipalities of Maricá, Saquarema, and Tanguá, Rio de Janeiro state, southeastern Brazil from January through December (A) Anuran abundance (black bars) and rainfall (grey squares and line); (B) anuran abundance (black bars) and temperature (grey triangles and line); (C) anuran abundance (black bars) and relative humidity (grey x and line) ly (Cardoso et al. 1989, Pombal 1997, Prado & Pombal 2005). Differentiated specialised diets of hylids might have furthered the successful colonisation of a wider variety of microhabitats, thus increasing the diversity of the family in anuran communities (Parmelee 1999). Magurran (1988) suggested that species diversity was high when Shannon-Wiener values were higher than 3.5, moderate at values between 1.5 and 3.5 and low at an index lower than 1.5, which possibly indicates areas impacted by human activities. Although our study area harbours Rainfall (mm³) Temperature ( C) Relative air humidity (%) Figure 4. Depth of the leaf litter layer (mm) recorded in Espraiado, municipalities of Maricá, Saquarema, and Tanguá, Rio de Janeiro state, southeastern Brazil, from January through December Black squares mark the mean depths and vertical traces indicate standard deviations. Asterisks represent the number of species captured in each month. high species richness, we found a low diversity index in the present study (H = 1.32). The results of similarity analyses showed two well-defined areas in the Atlantic Forest domain. This difference between the anuran compositions from areas in Paraná and São Paulo state to those from areas in Rio de Janeiro to Bahia state, agrees with other studies that also found a north-south division in the Atlantic Forest (Costa 2003, Grazziotin et al. 2006, Carnaval et al. 2009, Fitzpatrick et al. 2009, Martins 2011). Within the northern group, the higher level of similarity between Espraiado and areas in Rio de Janeiro (Parque Estadual dos Três Picos) and Minas Gerais (Parque Estadual Serra do Brigadeiro and RPPN Santuário do Caraça) states, all located in the Atlantic Forest domain or transition areas between the Cerrado and the Atlantic Forest domain, is probably due to the phytophysiognomic similarities among them, with less disturbed and denser vegetation areas composed of secondary forest. Moreover, similarity patterns could also be influenced by historical factors, such as the climatic changes that occurred during the Pliocene and/or the formation of refuge areas during the Pleistocene, which could have led to differences in the faunistic composition among different Atlantic Forest areas nowadays (Vasconcelos et al. 1992, Grazziotin et al. 2006, Carnaval & Moritz 2008). Microhabitat usage and spatial distribution According to our Chi-square results, we found that leaf litter/ground was by far the most commonly preferred microhabitat of anurans, which is probably due to the high abundance of species with terrestrial life habits (families Leptodactylidae, Microhylidae, Bufonidae, Craugastoridae, Brachycephalidae, Cycloramphidae, and Hylodidae) as compared to arboreal and/or aquatic habits (Hylidae 34
9 Anuran community of Espraiado, state of Rio de Janeiro Figure 5. Dendrogram of a cluster similarity analysis among Brazilian Atlantic Forest areas, using the Jaccard index and group-average method. and Hemiphractidae). Spatial partitioning of ecological resources enables species to coexist in a small area (Crump 1974). Thus, the great number of microhabitats at ground level found herein, such as water, rocks, sand and different levels in the leaf litter, facilitates the simultaneous presence of several species from different families (Brachycephalidae, Bufonidae, Craugastoridae, Cycloramphidae, Hylodidae, Leptodacty li dae, Microhylidae, and Odontophrynidae) in the area as well as their high abundances. For instance, water, sand and rock microhabitats (all located on river banks) were mainly used by Cycloramphidae, Hylodidae and Leptodacty li dae species, while leaf litter was preferred by Brachycephalidae, Bufonidae, Microhylidae, and Odontophrynidae species. Among the species found on or in the leaf litter, Ischno cnema spp. and Haddadus binotatus exhibit adaptations to water-independent reproduction, such as the direct development of terrestrial eggs (Had dad et al. 2008, Hedges et al. 2008). Hylodes cf. pipilans was always found near streams and specimens were occasionally encountered on leaves or branches above ground. The occupation of leaves or branches by H. cf. pipilans could possibly be a result of a defensive strategy, as was found by Almeida-Gomes et al. (2007) who previously observed a spatial segregation among the members of Hylodidae, with Hylodes phyllodes retreating to more vertical microhabitats when disturbed or scared by an observer. Concerning arboreal species, some Hylidae and Hemiphractidae species strictly associated with bromeliads were recorded in the study area, such as Scinax aff. v-signatus and Fritziana goeldii. According to Peixoto (1995), members of the Scinax perpusillus group (such as S. aff. v-signatus), Gastrotheca albolineata and F. goeldii are categorized as bromeligenic species, due to their biological dependence on bromeliads, although we failed to record G. albolineata from bromeliads (for more information, see Pontes et al. 2012) Abundance rates and different methodologies Regarding amphibian abundance, our results are similar to previous studies undertaken in coastal lowlands and other areas in Rio de Janeiro state (Almeida-Gomes et al. 2008, 2010, Martins et al. 2012, Pontes et al. unpubl. data). Differences between abundance rates may be a result of applied methods and/or habitats investigated. Higher abundances recorded with the VES method (Pontes et al. unpubl. data: 4.2 individuals/hour, Siqueira et al. 2011a: 3 individuals/ hour) are probably caused by a greater sampling effort in different habitats by previous authors, such as temporary and permanent ponds. The higher abundance found in these diverse habitats might be related to the lek system found in almost all anuran communities, which consequently leads to a high aggregation of species and individuals around these areas (Wells 2007). Hence, the mostly riverine sampling carried out in this study, where anuran individuals are sparsely distributed with some small aggre- 35
10 Angele Martins et al. gations, could yield a lower abundance rate as compared to Pontes et al. (unpubl. data) simply because fewer individuals are captured in this manner. On the other hand, Pontes et al. (in press), Martins et al. (2012) and Siqueira et al. (2011b) recorded a lower abundance of anuran species (1.7 individuals/hour, 0.9 individuals/hour and 0.3 individuals/hour, respectively), which might be a consequence of their sampling in less diverse habitats (such as restinga and rocky seashore ecosystems) or disturbed remnants that may have a low abundance of anuran species to begin with. Regarding plot sampling, we believe that the leaf litter frog density values obtained in our study (4 individuals/100 m 2 ) could be underestimated, because the low abundances recorded herein by means of plot-sampling might have been due to the inefficiency of sampling plots of 1 m 2 rather than 2 1 m (2 m 2 ), as previously judged more effective by Rocha et al. (2001). Nevertheless, a comparison of the few accessible data on the density of leaflitter frogs obtained through plot-sampling indicates that the density recorded here is higher than in disturbed areas (e.g., Almeida-Gomes et al. 2010: 3.1 individuals/100 m 2, Cambuci) and lower than in well-preserved areas such as Três Picos and Cachoeiras de Macacu (Siqueira et al. 2011b: 13.2 individuals/100 m 2 ) and Reserva Rio das Pedras (Rocha et al. 2013: 10.1 individuals/m 2 ) both in the state of Rio de Janeiro, and Serra das Torres mountains, in Espírito Santo state (Oliveira et al. 2013: 6.6 individuals/100 m 2 ). The results obtained from the rarefaction curve and the Jaccknife1 estimator suggest that the species composition is still underestimated, and more long-term studies may reveal the presence of additional species in the area. Future studies should be complemented with combined and/ or different approaches in fieldwork, such as the use of pitfall traps for leaf-litter species, increased visual search times, and the use of larger plots (e.g., 2 m 2 ). Although the use of pitfall traps has not proven to be an efficient method for short herpetofaunal surveys in Atlantic Forest areas (Siqueira et al. 2011a, Almeida-Gomes et al. 2008, 2010), a few studies have proven the importance of this methodology for enhancing the capture potential of leaflitter frogs in some Atlantic forest areas (e.g., Martins et al. 2012). Therefore, the use of pitfall traps in a future longterm study may prove to be important to increase leaf-litter frog capture rates. Moreover, increasing visual search times during dusk and night will surely maximize encounter rates, considering that the VES method has been demonstrated to be the most efficient method for capturing frogs in Brazilian rainforest areas (e.g., Almeida-Gomes et al. 2010, Siqueira et al. 2011a, Martins et al. 2012). Study area and the importance of forest fragment conservation Several studies conducted within disturbed and small (ca ha) Atlantic Forest fragments (e.g., Almeida Gomes et al. 2008, Santana et al. 2008) reported a low number (usually < 20 spp.) of species that are most commonly associated with disturbed environments. According to Almeida-Gomes et al. (2010), such fragments may suffer an irreversible loss of diversity and species richness that will directly affect anuran communities. However, the high species richness in a small fragment (ca. 800 ha.) obtained herein might be historically explained with to the emerging of vegetation matrices in the past decades. In other words, the studied area has been subjected to intense disturbances, such as the removal of original vegetation for the use of land as pastures and plantations, and, therefore, only some small forest fragments remained unaltered over time mostly on top of the mountains. These remnants might have played an important role for the continued existence of anuran assemblages in forest islands that now serve as refuges. Where agricultural activities were abandoned later, these fragments could reconnect, allowing amphibian populations to recolonise previously hostile areas. Therefore, the low number of species previously reported by other authors (e.g., Almeida-Gomes et al. 2008, Feio & Ferreira 2005, Santana et al. 2008, Lucas & Fortes 2008) in small remnants may be a direct effect of a lack of forest islands as a source of subsequent recolonisation. Thus, although some studies affirm that secondary forests and remnants may not represent potential refuges for many threatened species (Gardner et al. 2006), the results here observed suggest that disjunctive small remnants that currently do not harbour substantial species richness can with the effort of conservation initiatives become relevant areas for the maintenance of anuran assemblages in the future. Species conservation status and perspectives According to the IUCN Red List, Scinax trapicheiroi is classified Near Threatened (NT) due to its small distribution range (less than 20,000 km 2 ), even though it occurs in a habitat that is not immediately threatened, and therefore, its population is probably not in decline. However, according to Luna-Dias et al. (2009) and the results from our study (not only concerning distribution, as well as abundance), the new localities from which the species was recorded expands its known distribution range (this study = ~ m 2 ), and chances are that the populations of this species are merely unknown and poorly studied rather than in decline. However, considering the results of our study, detailed studies should be conducted to elucidate its population status. The small distribution range of the species, in conjunction with intense habitat loss and fragmentation might call for urgent measures to be taken in order to preserve the fragments where these frogs are still found. Male specimens of Hylodes cf. pipilans were all juvenile, which did not allow to identify this species with the required certainty. If our specimens are confirmed to represent Hylodes pipilans, the species will be included in the list of Data Deficient species, and, therefore, the conservation of forest fragments where it is found will not only increase the chances for its population to survive, but also 36
11 Anuran community of Espraiado, state of Rio de Janeiro allow future studies on the systematics and natural history, and assisting with a proper definition of the conservation status of the species. Our data presented herein may be useful for suggesting the implementation of a legally protected area comprising the fragments studied. This measure is necessary considering the ongoing anthropogenic disturbances caused by harmful tourist activities in the area, which might directly affect species such as Scinax trapicheiroi, and species about which little ecological and natural history information exists. Only the urgent implementation of protection measures will ensure effective and direct results for the species conservation in this area. Acknowledgements We acknowledge the assistance of members of the Setor de Herpetologia of Museu Nacional/UFRJ, especially Daniel Bastos Maciel da Silva, Ana Carolina Calijorne Lourenço, and Paula Cabral Rodrigues, for their support in our fieldwork. Special thanks are due to Mauricio Almeida Gomes for his valuable suggestions on the manuscript, and to Carla Cassini for her identification of Adenomera spp. We would also like to thank the reviewers and editors who contributed valuable suggestions on the manuscript. We are furthermore grateful to Sérgio Martins and Graça Martins for their logistical support; to SISBIO IBAMA for issuing a scientific research permit (n ), to the Museu Nacional/UFRJ for supporting us with equipment; and to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and the Fundação de Amparo à Pesquisa do Rio de Janeiro (FAPERJ) for the authors postgraduate scholarships. References Abrunhosa, P. A., H. Wogel & J. P. Pombal(2006): Anuran temporal occupancy in a temporary pond from the Atlantic Rain Forest, South-Eastern Brazil. Herpetological Journal, 16: Almeida-Gomes, M., M. Almeida-Santos, P. Goyannes- Araújo, V. N. T. 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